v2 new feature - Equivalent Roughness Height

MIDUSS design routines use the Manning ‘n’ to describe surface
roughness. Users who prefer to define roughness in terms of the
equivalent roughness height can use the Roughness Height tool to
convert from roughness height to Manning ‘n’. Once calculated, the
computed value can imported into the next design command by clicking
the [Use for Design] button.

The conversion uses
the following equation where g = gravitational acceleration and k =
roughness height.